| 摘要 |
PURPOSE:To obtain a circuit which generates pulses securely by letting a comparator make a comparison between a control voltage and composite voltage outputted by an AND gate supplied with an analog value obtained from a clock signal by D/A conversion and the whole output of a counter. CONSTITUTION:A clock signal from clock generating circuit 7 is inputted to counter 8, whose output is D/A-converted 9 into an analog value, which is inputted to comparator 13. The output signal of counter 8 is inputted to AND gate 12; when all bits are 1, gate 12 sends it output to comparator 13 together with the output of D/A9, it is compared with reference voltage, EC, and when it exceeds voltage EC, comparator 13 generates an output pulse. As a result, an inexpensive circuit which generates an output pulse securely with high precision even if there wound be dispersion of constitutent parts, control voltage, etc., can be obtained because of a small number of components. |
